clarion/app/controllers/concerns/public_api_exposing.rb

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require "active_support/concern"
module PublicApiExposing
extend ActiveSupport::Concern
def set_access_control_headers
if request.format.json?
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response.headers["Access-Control-Allow-Origin"] = "*"
end
end
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included do
before_action :set_access_control_headers
end
end